Bibliografia

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\section{Introduction}

According to the handbook of van Leunen \cite{vanleunen}, this paragraph---and certainly this section---should be longer than one sentence.

\section{More references}

Here we see if the reference \cite{Narendra_1990} to the Narendra article comes out OK, in particular, with volume, number \& pages.

The necessary information for those who would use BibTeX is available in the 1988 document of Prof.\ Patashnik \cite{btxdoc}.
Interested readers who can read French may also want to read Poussin's proof\cite{primes}, though it has nothing at all to do with BibTeX.

\section{Conclusion}

This is the concluding paragraph. Here I cite another of
Oren Patashnik's books\cite{btxhak} and, again, van Leunen's and Poussin's \cite{vanleunen,primes}.

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@string{jgr = "J.~Geophys.~Res."}

@MISC{primes, author = "Charles Louis Xavier Joseph de la Vall{\'e}e Poussin", note = "A strong form of the prime number theorem, 19th century", year = 1879 }

@INBOOK{chicago, title = "The Chicago Manual of Style", publisher = "University of Chicago Press", edition = "Thirteenth", year = 1982, pages = "400--401", key = "Chicago" }

@BOOK{texbook, author = "Donald E. Knuth", title= "The {{\TeX}book}", publisher = "Addison-Wesley", year = 1984 }

@BOOK{latexbook, author = "Leslie Lamport", title = "{\LaTeX \rm:} {A} Document Preparation System", publisher = "Addison-Wesley", year = 1986 }

@UNPUBLISHED{btxdoc, author = "Oren Patashnik", title = "{Using BibTeX}", note = "Documentation for general BibTeX users", month = jan, year = 1988 }

@UNPUBLISHED{btxhak, author = "Oren Patashnik", title =